Preheat the oven to 350°F (175°C). Grease a 9" square or 9" round baking pan and set it aside.

In a large mixing bowl, whisk together 1 cup all-purpose flour, 1 cup granulated sugar, 1/4 cup unsweetened cocoa powder, 1 teaspoon baking powder, 1/2 teaspoon baking soda, and 1/4 teaspoon salt until evenly combined.

Add 1 large egg, 1 teaspoon vanilla extract, 1/2 cup milk, and 1/2 cup vegetable oil to the dry ingredients. Whisk until the mixture is smooth and uniform.

Pour in 1/2 cup hot coffee and whisk until the batter is smooth. Scrape the bowl as needed to incorporate all ingredients.

Pour the batter into the prepared pan and smooth the top. Bake in the preheated oven for about 25 minutes, or until a toothpick inserted into the center comes out clean. Remove from the oven and let the cake cool in the pan for 10–15 minutes.

While the cake is baking, toast the kataifi: heat a large heavy-duty skillet over medium heat, add 2 cups shredded kataifi and 2 Tablespoons butter, and cook, stirring occasionally, until the kataifi is golden brown and crispy. Transfer the toasted kataifi to a medium mixing bowl.

Add 1 cup pistachio cream to the toasted kataifi and gently mix until evenly combined to form the pistachio filling.

Chop the 4 oz milk or semi-sweet chocolate bar into small pieces. Place the chopped chocolate and 1/2 cup heavy cream (or a can of table cream) in a medium microwave‑safe bowl. Microwave for 45 seconds or until the cream is warmed through. Let the bowl sit undisturbed for 3–5 minutes, then whisk gently until the chocolate is completely melted and the mixture is smooth.

After the cake has cooled the 10–15 minutes in the pan, spread the pistachio filling evenly over the top of the cake using an offset spatula or the back of a spoon.

Pour the chocolate mixture evenly over the pistachio layer and use a spatula to spread it if needed so it covers the pistachio layer.

Garnish with some of the toasted kataifi from step 6 (and additional pistachio cream if you reserved any). Serve warm immediately, or allow the assembled cake to set in the refrigerator before slicing and serving.